Normally that would just mean I'd toss them on top and move on, but the box was a mess. So I took everything out, arranged the instructions by paper size, and put them back in an orderly fashion that will leave room for more instructions throughout the year (but probably not much longer).
Whilst organizing, I quite enjoyed sifting through the instructions, with their pictures of the sets and the memories that came with. And a few "oh right, that was a set. And I had two because I really wanted those couple distinct pieces" moments.
Now, I had some cool sets since the new millennium, but the nostalgia factor kicked in as I kept finding instructions for sets from the 90s. Exploriens, Insectoids, Throwbots, Outback, Hydronauts--I even have the large plastic stringray I need to eventually fit into a MOC. Definitely some cool stuff there.
Maybe I'll even go back and rebuild a few of those sets.
Fun fact: I do have an old 90s set still built. The Robo Raider, from Roboforce. That minifig is awesome, and considering I don't have anything older than recent stuff built, I never have the heart to take it apart.